package dd.lo.chapter11;

import dd.lo.chapter10.Example3;
import dd.lo.util.ImageUtils;
import javafx.application.Application;
import javafx.application.Platform;
import javafx.concurrent.Task;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.FlowPane;
import javafx.scene.text.Text;
import javafx.stage.FileChooser;
import javafx.stage.Stage;
import org.opencv.core.*;
import org.opencv.imgcodecs.Imgcodecs;
import org.opencv.imgproc.Imgproc;

import java.io.ByteArrayInputStream;
import java.io.File;

/**
 * 代码样例：Example 11-1. An affine transformation
 */
public class Example1 extends Application {

    public static void main(String[] args) {
        System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
        launch(args);
    }

    private static final int DEFAULT_WIDTH = 1080;
    private static final int DEFAULT_HEIGHT = 768;

    private enum Mode {
        ORIGIN,
        AFFINE_TRANSFORM,
        ROTATE,
        ;
    }

    private ImageView imageView;

    private Mat srcImg;

    private int modeIdx = 0;

    private Mode mode = Mode.ORIGIN;

    private void displayImage() {
        Task<Void> task = new Task<Void>() {
            @Override
            protected Void call() {
                Mat dst = new Mat();
                srcImg.copyTo(dst);
                if (mode == Mode.AFFINE_TRANSFORM) {
                    //COMPUTE AFFINE MATRIX
                    MatOfPoint2f srcTri = new MatOfPoint2f(
                            new Point(0, 0) //top left
                            , new Point(srcImg.cols() - 1, 0) //top right
                            , new Point(0, srcImg.rows() - 1) //bottom left
                    );
                    MatOfPoint2f dstTri = new MatOfPoint2f(
                            new Point(0, srcImg.rows() * 0.33) //top left
                            , new Point(srcImg.cols() * 0.85, srcImg.rows() * 0.25) //top right
                            , new Point(srcImg.cols() * 0.15, srcImg.rows() * 0.7) //bottom left
                    );
                    Mat warpMat = Imgproc.getAffineTransform(srcTri, dstTri);
                    //Warp affine, borders are set to black
                    Imgproc.warpAffine(dst, dst, warpMat, srcImg.size(), Imgproc.INTER_LINEAR, Core.BORDER_CONSTANT, new Scalar(0, 0, 0));
                } else if (mode == Mode.ROTATE) {
                    Point center = new Point(srcImg.cols() * 0.5, srcImg.rows() * 0.5);
                    double angle = 60;
//                    double scale = (Math.cos((angle - 60) * Math.PI / 180) + 1.05) * 0.8;
                    double scale = 1;
                    Mat rotateMat = Imgproc.getRotationMatrix2D(center, angle, scale);
                    //Warp affine, borders are set to black
                    Imgproc.warpAffine(dst, dst, rotateMat, srcImg.size(), Imgproc.INTER_LINEAR, Core.BORDER_CONSTANT, new Scalar(0, 0, 0));
                }
                //调整图片大小以用于展示
                ImageUtils.fitImgSize(dst, DEFAULT_WIDTH, DEFAULT_HEIGHT);
                MatOfByte buffer = new MatOfByte();
                Imgcodecs.imencode(".jpeg", dst, buffer);
                Platform.runLater(() -> imageView.setImage(new Image(new ByteArrayInputStream(buffer.toArray()))));
                return null;
            }
        };
        new Thread(task).start();
    }

    @Override
    public void start(Stage stage) {
        Button imageChooser = new Button("选择图片");
        imageChooser.setOnMouseClicked(e -> {
            FileChooser fileChooser = new FileChooser();
            fileChooser.setTitle("请选择图片");
            fileChooser.setInitialDirectory(new File(System.getProperty("user.home") + "/Downloads")
            );
            fileChooser.getExtensionFilters().addAll(
//                    new FileChooser.ExtensionFilter("All Images", "*.*"),
                    new FileChooser.ExtensionFilter("JPEG", "*.jpeg"),
                    new FileChooser.ExtensionFilter("WEBP", "*.webp"),
                    new FileChooser.ExtensionFilter("PNG", "*.png"),
                    new FileChooser.ExtensionFilter("JPG", "*.jpg"),
                    new FileChooser.ExtensionFilter("GIF", "*.gif"),
                    new FileChooser.ExtensionFilter("BMP", "*.bmp")
            );
            File imgFile = fileChooser.showOpenDialog(stage);
            if (null == imgFile) {
                System.out.println("用户取消选中文件");
                return;
            }
            //读取一张图片
            srcImg = Imgcodecs.imread(imgFile.getAbsolutePath(), Imgcodecs.IMREAD_UNCHANGED);
            if (srcImg.empty()) {
                throw new RuntimeException("图片读取失败");
            }
            displayImage();
        });
        //Mode indicator
        Text modeText = new Text("当前模式：" + mode);
        Button prevModeButton = new Button("上一个模式");
        prevModeButton.setOnMouseClicked(e -> {
            --modeIdx;
            modeIdx = (Mode.values().length + modeIdx) % Mode.values().length;
            mode = Mode.values()[modeIdx];
            modeText.setText("当前模式：" + mode);
            displayImage();
        });
        Button nextModeButton = new Button("下一个模式");
        nextModeButton.setOnMouseClicked(e -> {
            ++modeIdx;
            modeIdx = modeIdx % Mode.values().length;
            mode = Mode.values()[modeIdx];
            modeText.setText("当前模式：" + mode);
            displayImage();
        });
        //Exit button
        Button exitButton = new Button("关闭");
        exitButton.setOnMouseClicked(e -> {
            Platform.exit();
        });
        FlowPane bottomControl = new FlowPane();
        bottomControl.getChildren().addAll(imageChooser, prevModeButton, modeText, nextModeButton, exitButton);
        BorderPane root = new BorderPane();
        imageView = new ImageView();
        root.setCenter(imageView);
        root.setBottom(bottomControl);
        Scene scene = new Scene(root, DEFAULT_WIDTH, DEFAULT_HEIGHT + 50);
        stage.setScene(scene);
        stage.setTitle("Example1-Warp affine");
        stage.setResizable(false);
        stage.setOnCloseRequest(e -> {
            System.out.println("Receive close request");
            e.consume();
        });
        stage.show();
    }
}
